Wrench.



PATENTED MAR. 3l, 1908.

Y -LA ROY` CHAPMAN.

WRENCH.

urmou'rox runn Dnc. 24. 1901.

lll llhwlfvl u v ll lll

lll 1 lllll H mw.

nuupnnuun UNrTED srarilsrnnr OFFICE..

LA ROY CHAPMAN, OF BERWIND,GOLORADO.

WRENCH.

Application filed December 24, 1907.

To all whom it may concern:

Be it known that l., LA ROY CHAPMAN, a citizen of the United States, residing at Berwind, in the county of Las Animas and State of Colorado, have invented a new and useful Vrench, of which the following is a specification.

This invention relates to wrenches; and has for its object to provide a strong, simple and thoroughly e''l'icient implement designed especially for a pipe wrench and having duplex jaws.

The outer member of each jaw is formed on opposite ends of a head pivotally mounted between threaded plates, slidable on each side of a flat plate continuous with the handle of the wrench; and moved by a rotatable nut. The construction of the wrench is such that all strains engendered by operating the` same are taken by the stronger and firmer parts, leaving the nut and thread free from stress.

With this and other objects in view, the invention consists of the novel construction, combination and arrangement of parts hereinafter described, and pointed out in the claims, and illustrated in the accompanying drawing, in which Figure 1 is a side elevation of the wrench. Fig. 2 is an elevation view at a right angle to Fig. 1 in the direction of the arrow A. Fig. 3 is a central longitudinal sectional view on the line of Fig. 1. Fig. 4 is a cross section al view on the line 4-4 of the same figure. Fig. 5 is a perspective view of the pivoted double jaw.

Similar numerals of reference are used for the same parts on all the iigures.

The handle 1 of the wrench is preferably cylindrical in form, of any length desired, and made of metal, the upper end of which terminates in a flat plate 2 extending in the axial line of the handle, its width being the same as the diameter of the handle and its thickness about one-third thereof. At the end of the flat plate 2 and on each edge there of is a curved projection thicker than the flat plate 2, the two projections forming fixed jaws separated on each side of the plate 2 by a channel or slot 2a, one jaw 3 having prominent parallel transverse teeth 4 on its outer edge and the other jaw 5 provided on its like edge with a roughened surface 6.

7 and 8 indicate threaded plates situated on opposite sides of the flat plate 2, each threaded plate having an inner flat surface in contact with the respective side of said llat Specification of Letters Patent.

Patented March 31, 1908.

Serial No. 407,956.

plate and an outer curved side, the radiusiof which is the same as that of the handle .1, joining the flat side at the edges of the flat plate 2, as clearly shown in Figs. 1 and `4. On the curved surfaces of the plates 7 and-8 are a plurality of slightly inclined `ribs 9 which together form a screw thread, reaching from the lower ends of said plates to andibeyond the centers thereof. A nut 1() is rotatably mounted on the threaded plates 7 and 8 and held against endwise movement by a wedge or pin 1 1 seated in a hole in the plate 2 below the nut and projecting beyond each edge thereof, the pin holding the nut against the lower edgesof the fixed jaws 3 Vand 5. Then the nut 10 is turned, the threaded plates are moved endwise along the flat plate 2, the direction of movement depending on the direction in which the vnut is turned. lf the pin 11 be withdrawn, the nut can be removed by unscrewing it and slipping it over the handle, the threaded plates and the movable jaws also may then be disconnected.

The threaded plates 7 and 8 slide in the channels or slots 2d between the ixed aws 3 and 5, their outer ends projecting beyond said jaws and su port between them a head 14, intermediat'ey pivoted to said ends 12 and 13 by a pin 15. The heads of the thread` ed plates 7 and 8 are curved on the axis of the pin 15 and seated in similarly shaped recesses 16 in the pivoted wrench head 14, as indicated in Figs. 1 and 5. The wrench head 14 is provided with two jaws 17 and 18 one at each end ofthe head. The jaw 17 has transverse teeth 19 on its under side and coacts with the xed jaw 3, the other jaw 18, shorter than the jaw 17, has its under surface roughened at 20 and coacts with the fixed jaw 5. As thus constructed, the movements of the threaded plates 7 and 8, heretofore described, increase and decrease the space between the fixed and movable jaws, so as to grip pipes of different sizes, and having a pivoted mounting, the jaws are self releasing. The handle, the flat plate 2, and the fixed jaws 3 and 5 are integrally formed and can be economically and rapidly made by forging with a minimum of machine work the threaded plates may also be forged complete and, if necessary, the threads thereon may be machine iinished. It is to be noted that in this wrench there are no sockets nor interior openings to be constructed and finished, everything being on the outside. The channels 2EL between the j aws guide the threaded plates 7 and 8 and receive the strain when the wrench is in operation. The implement as a whole is a strong, useful, simple and convenient tool.

I claim l. A wrench comprising a handle, a flat plate continuous therewith having Xed jaws on its outer end, a slidable threaded plate on each side of said lat plate, a nut mounted on said threaded plates for moving them in unison, and a head pivoted between the outer ends of said threaded plates having a jaw at each end.

2. A wrench comprising a i'lat body plate having oppositely disposed xed jaws on its outer end thicker than said plate, a threaded plate slidable on each side of said 'flat plate and guided by a channel between said jaws, a nut for moving said threaded plates, and a head intermediately pivoted between the ends of said threaded plates having a jaw on each end.

3. A wrench having a iiXed aw and a movable jaw, a ilat plate narrower than said fixed jaw and integral therewith, a plate having an outer curved threaded face and a fiat face slidable on each side of said flat plate and pivotally supporting said movable aw, and a nut for moving said threaded plates.

4. A wrench having a double fixed jaw and a double movable jaw, a flat plate narrower than said fixed jaws and connected thereto, a plate having an outer curved threaded face and an inner iiat face slidable on each side of said flat plate and guided by a channel between said iXed jaws and pivotally supporting said movable jaws, a nut mounted on said threaded plates and bearing against the under side of the jaws, and a removable pin eX tending through said flat plate below said nut.

5. A'wrench having a lat body plate with a iXed jaw on each edge at one end, said jaws being thicker than the plate and forming a channel between them, a plate having a curved face with inclined ribs and a Hat face L joining said curved face slidable on each side of said lat plate, a head ivoted to the upper ends of said ribbed p ates having a jaw on each side adapted to engage with the iiXed jaws, and a nut engaging said inclined ribs to move the pivoted head.

In testimony that I claim the foregoing as my own, I have hereto ahxed my signature in the presence of two witnesses.

LA ROY CHAPMAN. Witnesses:

JAs. T. MCDERMOTT, BEN JoHNsoN. 

